220 40976 article Path: news.gmane.org!.POSTED!not-for-mail From: Daniel Gutson Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Pointer to pointer representation Date: Mon, 12 Nov 2018 00:37:13 -0300 Lines: 142 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="0000000000007e3361057a6f6b22" X-Trace: blaine.gmane.org 1541993724 21035 195.159.176.226 (12 Nov 2018 03:35:24 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 12 Nov 2018 03:35:24 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDE3NBMV6UFBB6HKUPPQKGQEVKBSSFA@isocpp.org Mon Nov 12 04:35:20 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lj1-f197.google.com ([209.85.208.197]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gM30R-0005K3-3W for gclcip-std-proposals@m.gmane.org; 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[209.85.220.41]) by mx.google.com with SMTPS id m10-v6sor7545290lje.8.2018.11.11.19.37.27 for (Google Transport Security); Sun, 11 Nov 2018 19:37:27 -0800 (PST) Received-SPF: pass (google.com: domain of danielgutson@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Received: by 2002:a2e:93ca:: with SMTP id p10-v6mr11630009ljh.158.1541993846942; Sun, 11 Nov 2018 19:37:26 -0800 (PST) In-Reply-To: X-Original-Sender: danielgutson@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=vSJLZgk5; spf=pass (google.com: domain of danielgutson@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=danielgutson@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:40976 Archived-At: --0000000000007e3361057a6f6b22 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I can think of: template indirections_type::type That would represent N indirections to an object of type T (this can be easily done with TMP). Then a function can be provided to dereference one of those types: template T& dereference_indirections(indirections_type::type ptr); Would this solve your issue? El lun., 29 oct. 2018 4:00, escribi=C3=B3: > Hi, > > If we have a container of unitque_ptr/shared_ptr objects, to reference to > them we can usethe follow notations: > > *p->FuncMember();* //Same as *(*p).FuncMember();* > > but, some times I need to create a pointer to this pointer and I use to > write the follow notation: > > *(*p2p)->FuncMember();* > > I think it will be a good idea if c++ could have a notation to this > situations like: > > *p2p=3D>FuncMember() *//or > > *p2p+>FuncMember()* //or > > *p2p#>FuncMember()* //or > > *p2p:>FuncMember()* > > What do you think? > > I hope I helped in some way. > > > -- > You received this message because you are subscribed to the Google Groups > "ISO C++ Standard - Future Proposals" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to std-proposals+unsubscribe@isocpp.org. > To post to this group, send email to std-proposals@isocpp.org. > To view this discussion on the web visit > https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/eeb29435-11b= 6-424e-8434-c0aeef0977f1%40isocpp.org > > . > --=20 You received this message because you are subscribed to the Google Groups "= ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. To view this discussion on the web visit https://groups.google.com/a/isocpp= ..org/d/msgid/std-proposals/CAFdMc-0MkQhLbiY64uSYXd8U4URzkukz3beO3Hgrx9Ni8y7= rBA%40mail.gmail.com. --0000000000007e3361057a6f6b22 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I can think of:

template<class T, unsigned in= t N>
indirections_type<T, N>::ty= pe

That would represent = N indirections to an object of type T (this can be easily done with TMP).

Then a function can be pr= ovided to dereference one of those types:

=
template<class T, unsigned int N>
T& dereference_indirections(indirections_type<T, N>::type p= tr);

Would this solve yo= ur issue?

El lun= .., 29 oct. 2018 4:00, <tecoberg@g= mail.com> escribi=C3=B3:
Hi,=C2=A0

If we have a containe= r of unitque_ptr/shared_ptr objects, to reference to them we can usethe fol= low notations:

p->FuncMember();=C2=A0=C2= =A0 //Same as (*p).FuncMember();

but, some = times I need to create a pointer to this pointer and I use to write the fol= low notation:

(*p2p)->FuncMember();

I think it will be a good idea if c++ could have a not= ation to this situations like:

p2p=3D>FuncMe= mber() //or

p2p+>FuncMember() //or

p2p#>FuncMember() //or

p2p:>FuncMember()

What do you= think?

I hope I helped in some way.


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